Module function reference

input_validate

A reference entry for input_validate

Module function · Validation

input_validate(fn f, string failure_message[, number max_times]) ⇒ mixed

Reads input until the supplied function accepts it, optionally stopping after a maximum number of attempts.

Examples

The validator can use a named function and its handle:

YASS

function check($x)
  if ($x == "password")
    return true
  else
    return false
  end if
end function

$value = Validation::input_validate(
  handle_of(check),
  "Incorrect password."
)
print($value)

An inline validator can check that a number is within a range:

YASS

$number = Validation::input_validate(
  function($x)
    $x = value($x)
    return $x > 10 and $x < 100
  end function,
  "Number must be between 10 and 100."
)
print($number)

A regular-expression validator can check a capitalised name:

YASS

$name = Validation::input_validate(
  function($x)
    return string_matches($x, "[A-Z][a-z]+")
  end function,
  "Name must start with a capital letter.",
  3
)
print($name)